Strange BLTouch issue. Hightmap it off while printing

Veti

that would be the result of one side of the x gantry sagging.
when you did your linear rod conversion, did you convert the cr-10 to dual z?

if yes, then you need to set up this
https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors

RocketPat

@Veti yea i am using dual z leadscrew but the duet 2 wifi featured a second slot for both axes parallel so i am only using 1 z output for both

Veti

@RocketPat
your z leadscrews are out of sync. you can correct it manually, but the dual z setup is faster and more accurate.

also unless you converted your cr 10 to 24v you are running your z motors at 6V, which might not be enough.

RocketPat

ah okey i am using a 12V PSU but if they run in parallel the voltage should be the same... only the current is dropping

Veti

the 2 z connectors on the duet actually run in series rather than in parallel.

from the linked site

Note that the Z driver (drive 2 on Duet2) has a dual socket wired in series for powering two z motors at once.

RocketPat

@Veti ohhh okey so that are some bad news i see haha okey. I will give the independent z setup a try.

Veti

@RocketPat said in Strange BLTouch issue. Hightmap it off while printing:

M584 X0 Y1 Z2 E3 ; set drive mapping

for now change this to
M584 X0 Y1 Z2:4 E3 ; set drive mapping

connect the second z motor to e1 and place the jumpers on the second z connector.

that way you are using 2 motors for now.

RocketPat

@Veti okey i only need to change that or do i have to do more suff i am reading that hole article for the frist time now and i am kinda scared to set up everythig new again. I will do a quick backup and give it a try.

Veti

@RocketPat

that changes allows you to use 2 motors for now.
you still need to do the rest later.

my guess for now is that you are losing steps because of the 6v dual z setup.

RocketPat

okey i am doing a quick first layer print and see what is happening, looking good so far. Nothing exploded.

RocketPat

So now i did quite a bit testing and i got a much better result.

Also the true leveling is working now. But i still have too low presure on the left side. I can get a print startet now and it would be working but maby my current is too low now.

Veti

did you measure the real offset of the probe?

RocketPat

yep i startet at x100 y100 and moved to x117 y143 what means that the offset should be -17 and -43

RocketPat

okey now i got a new problem, after i restarted the board the hightmap is getting generated but is not used. The motors dosen't correct my print anymore.

Phaedrux

Can you post your homeall/homez? Where are you probing on the bed to set z0? It looks like you're using a corner rather than the center of the bed.

RocketPat

this is my home all

; homeall.g
; called to home all axes
; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Oct 03 2020 22:18:40 

GMT+0200 (Mitteleuropäische Sommerzeit)
G91                     ; relative positioning
G1 H2 Z5 F6000          ; lift Z relative to current position
G1 H1 X-245 Y-285 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F6000       ; go back a few mm
G1 H1 X-245 Y-285 F360  ; move slowly to X and Y axis endstops once more (second pass)
G90                     ; absolute positioning
G1 X118 Y185 F6000      ; home Z
G30                     ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91                    ; relative positioning
;G1 Z5 F100             ; lift Z relative to current position
;G90                    ; absolute positioning

and this is home z

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Oct 03 2020 22:18:40 GMT+0200 (Mitteleuropäische Sommerzeit)
G91                ; relative positioning
G1 H2 Z5 F6000     ; lift Z relative to current position
G90                ; absolute positioning
G1 X20 Y55.5 F6000 ; go to first probe point
G30                ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91               ; relative positioning
;G1 Z5 F100        ; lift Z relative to current position
;G90               ; absolute positioning

RocketPat

@Phaedrux in the home all i am using the middle of my bed

Veti

@RocketPat

do you still have the G29 in the start script?

RocketPat

yep right after i home all

M107
;M190 S45	  ;set bed temperature and wait for it to be reached
G28          ;Home axis
G29

M109 S210 ;
M107         ; Turn layer fan off
G21          ; Set to metric change to G20 if you want Imperial
G90          ; Force coordinates to be absolute relative to the origin

G0 X0 Y0 F9000 ; Go to front
G0 Z0.15 ; Drop to bed
G92 E0 ; zero the extruded length
G1 X80 E6 F780.000 ; Extrude filament in a 8cm line
G92 E0 ; zero the extruded length
G1 E-1 F780.000 ; Retract a little
G1 X80 F4000 ; Quickly wipe away from the filament line
G1 Z0.3 ; Raise and begin printing.

Veti

@RocketPat

while printing use M122 to check if mesh compensation is active